unaccustomed
1. [ adjective ] not customary or usual
Examples:

"an unaccustomed pleasure" "many varieties of unaccustomed foods" "a new budget of unaccustomed austerity"

Related terms: unusual
2. [ adjective ] not habituated to; unfamiliar with
Examples:

"unaccustomed to wearing suits"

Related terms: accustomed new unused_to
Similar spelling:   unchastened
  unjustified
  unacquisitive
  unicyclist
  unsecured
  unexcused